SOURCE

console 命令行工具 X clear 

                    

                        
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console

            
function changeSrc()
  {
  document.getElementById("myImage").src="//www.w3school.com.cn/i/eg_smile.gif"
  }

            
<img id="myImage" src="//www.w3school.com.cn/i/eg_bulbon.gif"> 
 <br>
 <br> 
 <input type="button" onclick="changeSrc()" value="改变图像">